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parametric equalizer LADSPA plugin

Four-band parametric equaliser. Each section has an active/bypass switch,
frequency, bandwidth and gain controls. There is also a global bypass
switch and gain control.

The 2nd order resonant filters are implemented using a Mitra-Regalia
style lattice filter, which has the nice property of being stable
even while parameters are being changed.

All switches and controls are internally smoothed, so they can
be used 'live' without any clicks or zipper noises. This should
make this plugin a good candidate for use in systems that allow
automation of plugin control ports, such as Ardour, or for
stage use.